So, I played through three times, and I'm curious about the lockbox you have to guard.
When you get Althea's dialog, it seems either she quits, or she steals the money. Is there a third path where you don't lose her, but you save the money?

As far as I remember, I've always assigned her to guard it when she asks and the only results I've gotten are the guarding succeeds and it's fine or it fails and the money gets stolen, but there's no indication Althea did it.

I actually don't think I've ever refused to let her guard it (generally because I want to get some loyalty back). Does she quit entirely or steal the money if you don't?